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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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This commit is contained in:
Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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34
modules/libpref/test/unit/test_bug345529.js Normal file
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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/licenses/publicdomain/ */
// Regression test for bug 345529 - crash removing an observer during an
// nsPref:changed notification.
function run_test() {
const Cc = Components.classes;
const Ci = Components.interfaces;
const PREF_NAME = "testPref";
var prefs = Cc["@mozilla.org/preferences-service;1"]
.getService(Ci.nsIPrefBranch);
var observer = {
QueryInterface: function QueryInterface(aIID) {
if (aIID.equals(Ci.nsIObserver) ||
aIID.equals(Ci.nsISupports))
return this;
throw Components.results.NS_NOINTERFACE;
},
observe: function observe(aSubject, aTopic, aState) {
prefs.removeObserver(PREF_NAME, observer);
}
}
prefs.addObserver(PREF_NAME, observer, false);
prefs.setCharPref(PREF_NAME, "test0")
// This second call isn't needed on a clean profile: it makes sure
// the observer gets called even if the pref already had the value
// "test0" before this test.
prefs.setCharPref(PREF_NAME, "test1")
do_check_true(true);
}